using my PIX 515 Firewall, can anyone help me? It would be best if I could stop all workstations in the district from accessing HTTPS sites, I'll just create an access list giving my Admins static ips access to HTTPS.

access-list outbound deny tcp any any eq https
Don't forget:
access-list outbound permit ip any any
If you don't put this you will deny everything outbound by virtue of doing the https deny because by default the assumption after that is deny all

I can still get through to the website I am trying to block and when I applied the access-group outbound in interface inside, it blocked everything (including our homepage) but did not block the website I WANT to block.

You are allowing all clients on those subnets to use https. When you say it didn't block the website you want to block, from what ip were you accessing the website from? if it's part of that block, access is allowed.
are those 5 class C blocks your admin ips?

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